Acknowledgements
Last updated 19 September 2026
Back2Back itself
Back2Back is © 2026 Jake Gregory. All rights reserved. The app, this website and the service behind them are his work; the components listed below are other people’s, used under their own licences and never his to give away.
Trademarks, and who Back2Back is not
Back2Back is independent software. It is not made, endorsed, certified or supported by AlphaTheta Corporation, Pioneer DJ or Pioneer Corporation, and none of them has any responsibility for it.
Pioneer DJ, AlphaTheta, CDJ, DJM, rekordbox and PRO DJ LINK are trademarks or registered trademarks of their respective owners. Apple, Mac and macOS are trademarks of Apple Inc. They are named on this website and in the app only to say what Back2Back works with.
The work this stands on
Back2Back owes a debt to Deep Symmetry (James Elliott and contributors) for years of careful, public research into the PRO DJ LINK protocol. Back2Back’s code is its own, and none of it is theirs; but the work was done with theirs open beside it, and it would have been a great deal harder without. Thank you.
Open-source software
Back2Back is built with open-source software, used under its own licences. The main components:
| Component | Used for | Licence |
|---|---|---|
| LiveKit (server, Rust SDK and browser client) | Audio transport | Apache License 2.0 |
| WebRTC (libwebrtc) | Real-time audio and the Opus codec | BSD 3-Clause |
| Tauri | The desktop app’s window and packaging | MIT or Apache License 2.0 |
| Tokio, axum, hyper, serde and the wider Rust ecosystem | The app’s and the server’s foundations | MIT or Apache License 2.0 |
| SQLite, through rusqlite | The account database | Public domain; MIT |
| cpal | Audio input and output | Apache License 2.0 |
| Symphonia | Reading audio files | Mozilla Public License 2.0 (used unmodified; its source is at github.com/pdeljanov/Symphonia) |
| lettre | Sending email | MIT |
| Caddy | HTTPS | Apache License 2.0 |
| Archivo, by Omnibus-Type | The typeface, in the app and on this website | SIL Open Font License 1.1 |
Every open-source package in the app and on the server, with the licence each is under, is in the full list. Each remains the property of its authors, and none of them endorses Back2Back.